Keros, Titan of Life's Blossom

When Keros, Titan of Life's Blossom, enters the battlefield, sacrifice it unless it escaped.
Whenever Keros enters the battlefield or attacks,
you gain life equal to the number of creatures
you control plus the number of lands you
control.
Escape —{g}{g}{w}{w}, Exile five other cards from
your graveyard. (You may cast this card from your
graveyard for its escape cost.)